A fast identification method for coherent clusters based on wide-area measurement information
An identification method and wide-area measurement technology, applied in the direction of reducing/preventing power oscillation, AC network circuits, circuit devices, etc., to achieve the effect of rapid online identification and sufficient time
Active Publication Date: 2019-04-23
江苏亿多力新能源科技有限公司
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[0032] After the power system is disturbed, the disturbance trajectory of the generator contains all the factors that affect the coherence among the units. Obtaining the coherence information of the coherent generator according to the swing curve of the generator can effectively improve the accuracy of the coherence grouping. The present invention performs second-order differential calculation on the generator power angle information in the wide-area measurement information to obtain the rotor angular acceleration of the generator; then performs trigonometric function fitting on the angular acceleration to obtain the angular acceleration change curve of the generator rotor, and then extracts the The corner points on the machine fitting curve. By comparing the amplitude difference and time difference of the adjacent corner points of each generator, the coherence between the two generators is determined, and the synchronous grouping is realized.
[0033] (1) Trigonometric functi...
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The invention relates to a wide area measurement information-based coherent generator group quick recognition method. The method comprises the steps of recording power angle information and sampling time of each generator in a clustering data window; calculating a rotor angular speed and a rotor angle accelerated speed of the generator by adopting a difference method; performing trigonometric function fitting on the rotor angle accelerated speed of the generator; performing derivation on the trigonometric functions obtained by fitting on each generator separately, calculating local extreme points to further determine an angle point of each set; determining whether corresponding angle points of every two sets are matched or not; traversing all generators, and updating a matching angle point number matrix; calculating the ratio of matched angle point number of every two generators to the angle points of the two generators, and determining whether the two generators are coherent or not; and traversing all generators, and updating a coherent matrix, and finishing the coherent clustering. By adoption of the coherent generator group quick recognition method, online recognition of the coherent generator group of an electric power system can be realized, so that sufficient time is provided for dynamic equivalence and disconnection control of the electric power system.
Description
technical field [0001] The invention relates to the control field of electric power system, in particular to a generator set coherence identification scheme based on wide-area measurement information. Background technique [0002] When the power system is disturbed, some generators in the system will have the same or similar swing characteristics. This phenomenon is called coherence, and these generators are called coherent fleets. When the power system is disturbed, identifying the coherent machine group in the power system and aggregating them into an equivalent machine can effectively simplify the system and reduce the calculation amount of the dynamic equivalent of the power system; 1. Accurate identification of coherent clusters is a prerequisite for out-of-synchronization separation. Therefore, it is of great significance to carry out coherent grouping on the power system. [0003] The existing coherent cluster identification algorithms are mainly divided into three ...
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IPC IPC(8): H02J3/24
CPCH02J3/24H02J2203/20
Inventor 张艳霞李莹
Owner 江苏亿多力新能源科技有限公司